NON-SURGICAL STRATEGY FOR ADULT EPENDYMOMA
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1 NON-SURGICAL STRATEGY FOR ADULT EPENDYMOMA Roberta Rudà Department of Neuro-Oncology University and City of Health and Science Hospital of Turin, Italy EORTC EANO ESMO Conference 2015 Istanbul, March
2 OUTLINE Natural history and patterns of relapse Role of radiotherapy Role of chemotherapy/targeted therapies Post-surgical management of spinal cord ependymomas Leptomeningeal spread
3 Intracranial ependymomas: patterns of relapse The vast majority of tumor recurrences (up to 90%) occurs as a result of lack of local tumor control Supratentorial tumors seem to have a higher risk of relapse Cerebrospinal fluid dissemination occurs in up to 15% of patients and is traditionally considered more frequent in anaplastic and infratentorial tumors. However, at presentation the incidence of leptomeningeal spread is less than 5% The occurrence of extraneural metastases is extremely rare (<1%). Kulkarni and Drake, 2001; Chamberlain, 2003; Kawabata et al, 2005; Mansur et al, 2005; Merchant and Fouladi, 2005; Shahid and Lewis, 2013; Pachella et al, 2014
4 Intracranial ependymomas: need for staging Craniospinal MRI and CSF cytology are mandatory following surgery. Regular surveillance with MRI may discover asymptomatic recurrences (43%) and impact subsequent treatment and survival (Good et al, 2001). Open questions: how often and for how long the surveillance with MRI? When CSF cytology is needed in the follow-up?
5 Post-surgical treatments: limitations of the studies The retrospective nature of most studies with small number of patients, the lack of randomized clinical studies, the heterogeneity in terms of age and location as well as the long time period analyzed in most series, explain the lack of evidence-based treatment strategies (aside from surgical resection).
6 Role of radiation therapy: general consensus For patients with anaplastic (gr.iii) ependymoma postoperative radiotherapy is the standard of care and conformal techniques are used to deliver to presurgical tumor bed (margin of 1-2 cm) total doses up to 60 Gy in conventional fractionation Craniospinal irradiation, considered for many years the standard of care, nowadays is reserved for patients with disseminated disease at presentation (or later in the course of the disease ) Shaw et al, 1987; Merchant et al, ;Reni et al, 2004;Rogers et al, 2005 Armstrong et al, 2010; Metellus et al,2010; Swanson et al, 2011
7 Role of radiation therapy: state of art and controversies in gr. II ependymomas Post-operative radiotherapy is used for treatment of patients with subtotal resection with total doses of Gy The role of post-operative radiotherapy after complete resection is controversial due to lack of evidence of a clear survival benefit Armstrong et al, 2010; Metellus et al,2010;vera-bolanos 2015
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11 Role of chemotherapy in ependymomas
12 Shahid and Lewis, Clinical Oncology, 2013
13 Temozolomide chemotherapy in ependymomas of the adult Xenograft models have documented activity of temozolomide against ependymoma (Friedman et al, 1995). Case descriptions reported some responses in both intracranial and spinal ependymomas (Rehmann et al, 2006; Freyschlag et al, 2011;Kim et al, 2011; Khoo et al 2013; Lombardi et al, 2013). A retrospective series of 25 patients treated with temozolomide standard schedule in pts failing platinum-based chemotherapy demonstrated modest efficacy: PR 4%,SD 36%, PD 60% with PFS of 2 months and OS of 3 months (Chamberlain et al, 2009). Many ependymomas express high levels of MGMT which confers resistance to alkylating agents (Buccoliero et al, 2008)
14 Temozolomide as salvage treatment for recurrent intracranial ependymomas of the adult: a retrospective study PATIENTS CHARACTERISTICS 18 patients ( ) 6 female 12 male Median age: 42 yrs (range: 18-61) Tumor histology: 10 grade III 8 grade II Tumor site: 11 supratentorial 7 infratentorial 8 with associated leptomeningeal spread Karnofsky: 70 median KPS (range: 60-90) MRI: 18 enhancing lesions Rudà et al, submitted
15 Results Responses Histological types TTP (months) CR 1/18 1 grade III 153 (13 yrs) PR 3/18 1 grade III 2 grade II SD 7/18 4 grade II 3 grade III PD 7/18 5 grade III 2 grade II 9 mo 9 yrs+ 6 mo 5 yrs+ 1-6 MGMT promoter methylation present in 5 patients and absent in 6 patients; no correlation was found with the response, PFS and OS Rudà et al, submitted
16 Shahid and Lewis, Clinical Oncology, 2013
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18 A phase II study of lapatinib and dose-dense temozolomide for adults with recurrent ependymomas: a CERN trial Treatment: TMZ mg/m2/d 7 days on/7 days off + Lapatinib (targeting Erb B1, Erb B2) 1250 mg/qd continous dosing Results: 50 patients enrolled (gr I, II, III WHO) 19 intracranial, 25 spinal cord, 6 multiple tumors Response:1 CR, 3 PR, 33 SD,12 PD Positive correlation between response and high Erb B2 mrna expression M. Gilbert et al, SNO Meeting, Miami Beach, November 2014
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20 Spinal cord ependymomas: general concepts Histologic subtypes: myxopapillary ependymoma (grade I) arising in the cauda equina and classic ependymoma (grade II or III) arising most commonly in the cervical and thoracic spinal cord. Relatively low risk of dissemination. Boström et al 2011; Tarapore et al, 2013
21 Spinal cord ependymomas: non-surgical management Post-operative local radiotherapy prolongs PFS and OS survival in gr.iii tumors (rare) Post-operative local radiotherapy prolongs PFS after subtotal resection in gr.ii tumors risk of radiation-induced myelopathy unknown Reirradiation (cyberknife) for local recurrences. Few data available on chemotherapy (oral etoposide, TMZ, other combinations) or target therapies (lapatinib, imatinib) Oh et al, 2013; Chao et al, 2011; Chamberlain et al, 2001; Nokamura et al, 2009
22 Spinal myxopapillary ependymomas: a challenging entity The prognosis after surgery for some myxopapillary ependymomas seems worse than generally believed (Bostròm et al, 2011); some series reported a better prognosis for gr.ii ependymomas compared to gr.i myxopapillary ependimomas (Tapore et al 2013) The pattern of relapse has been reported commonly as local (Shaw et al, 1987; Pica et al, 2009; Tsai et al, 2014) supporting the use of local RT; however, with a more extensive use of MRI screening, an increase risk of tumor dissemination has been observed (Weber et al 2015)
23 Spinal myxopapillary ependymomas: a challenging entity Radiotherapy is commonly reserved for patients with recurrent tumors Two recent series (Tsai et al, 2014 ; Weber et al, 2015) have reported that post-operative radiotherapy may improve local control and PFS in newly diagnosed patients These data must be confirmed in prospective studies with central review of pathology and extent of resection
24 CONCLUSIONS Post-operative radiotherapy following maximal safe resection is used in most patients with intracranial ependymomas Still unknown the value of post-operative radiotherapy after gross total resection in gr II tumors Chemotherapy with temozolomide has some role as salvage treatment Despite the increasing knowledge of molecular pathways in ependymomas, there is still a lack of druggable targets Prospective and randomized mulinational studies are needed
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